1 %{ 2 /****************************************************************************** 3 * 4 * Module Name: dtparser.y - Bison input file for table compiler parser 5 * 6 *****************************************************************************/ 7 8 /* 9 * Copyright (C) 2000 - 2016, Intel Corp. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification. 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19 * substantially similar to the "NO WARRANTY" disclaimer below 20 * ("Disclaimer") and any redistribution must be conditioned upon 21 * including a substantially similar Disclaimer requirement for further 22 * binary redistribution. 23 * 3. Neither the names of the above-listed copyright holders nor the names 24 * of any contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL") version 2 as published by the Free 29 * Software Foundation. 30 * 31 * NO WARRANTY 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 * POSSIBILITY OF SUCH DAMAGES. 43 */ 44 45 #include "aslcompiler.h" 46 #include "dtcompiler.h" 47 48 #define _COMPONENT DT_COMPILER 49 ACPI_MODULE_NAME ("dtparser") 50 51 void * AslLocalAllocate (unsigned int Size); 52 53 /* Bison/yacc configuration */ 54 55 #undef alloca 56 #define alloca AslLocalAllocate 57 58 int DtParserlex (void); 59 int DtParserparse (void); 60 void DtParsererror (char const *msg); 61 extern char *DtParsertext; 62 extern DT_FIELD *Gbl_CurrentField; 63 64 UINT64 DtParserResult; /* Expression return value */ 65 66 /* Bison/yacc configuration */ 67 68 #define yytname DtParsername 69 #define YYDEBUG 1 /* Enable debug output */ 70 #define YYERROR_VERBOSE 1 /* Verbose error messages */ 71 #define YYFLAG -32768 72 73 /* Define YYMALLOC/YYFREE to prevent redefinition errors */ 74 75 #define YYMALLOC malloc 76 #define YYFREE free 77 %} 78 79 %union 80 { 81 UINT64 value; 82 UINT32 op; 83 } 84 85 /*! [Begin] no source code translation */ 86 87 %type <value> Expression 88 89 %token <op> EXPOP_EOF 90 %token <op> EXPOP_NEW_LINE 91 %token <op> EXPOP_NUMBER 92 %token <op> EXPOP_HEX_NUMBER 93 %token <op> EXPOP_DECIMAL_NUMBER 94 %token <op> EXPOP_LABEL 95 %token <op> EXPOP_PAREN_OPEN 96 %token <op> EXPOP_PAREN_CLOSE 97 98 %left <op> EXPOP_LOGICAL_OR 99 %left <op> EXPOP_LOGICAL_AND 100 %left <op> EXPOP_OR 101 %left <op> EXPOP_XOR 102 %left <op> EXPOP_AND 103 %left <op> EXPOP_EQUAL EXPOP_NOT_EQUAL 104 %left <op> EXPOP_GREATER EXPOP_LESS EXPOP_GREATER_EQUAL EXPOP_LESS_EQUAL 105 %left <op> EXPOP_SHIFT_RIGHT EXPOP_SHIFT_LEFT 106 %left <op> EXPOP_ADD EXPOP_SUBTRACT 107 %left <op> EXPOP_MULTIPLY EXPOP_DIVIDE EXPOP_MODULO 108 %right <op> EXPOP_ONES_COMPLIMENT EXPOP_LOGICAL_NOT 109 110 %% 111 112 /* 113 * Operator precedence rules (from K&R) 114 * 115 * 1) ( ) 116 * 2) ! ~ (unary operators that are supported here) 117 * 3) * / % 118 * 4) + - 119 * 5) >> << 120 * 6) < > <= >= 121 * 7) == != 122 * 8) & 123 * 9) ^ 124 * 10) | 125 * 11) && 126 * 12) || 127 */ 128 Value 129 : Expression EXPOP_NEW_LINE { DtParserResult=$1; return 0; } /* End of line (newline) */ 130 | Expression EXPOP_EOF { DtParserResult=$1; return 0; } /* End of string (0) */ 131 ; 132 133 Expression 134 135 /* Unary operators */ 136 137 : EXPOP_LOGICAL_NOT Expression { $$ = DtDoOperator ($2, EXPOP_LOGICAL_NOT, $2);} 138 | EXPOP_ONES_COMPLIMENT Expression { $$ = DtDoOperator ($2, EXPOP_ONES_COMPLIMENT, $2);} 139 140 /* Binary operators */ 141 142 | Expression EXPOP_MULTIPLY Expression { $$ = DtDoOperator ($1, EXPOP_MULTIPLY, $3);} 143 | Expression EXPOP_DIVIDE Expression { $$ = DtDoOperator ($1, EXPOP_DIVIDE, $3);} 144 | Expression EXPOP_MODULO Expression { $$ = DtDoOperator ($1, EXPOP_MODULO, $3);} 145 | Expression EXPOP_ADD Expression { $$ = DtDoOperator ($1, EXPOP_ADD, $3);} 146 | Expression EXPOP_SUBTRACT Expression { $$ = DtDoOperator ($1, EXPOP_SUBTRACT, $3);} 147 | Expression EXPOP_SHIFT_RIGHT Expression { $$ = DtDoOperator ($1, EXPOP_SHIFT_RIGHT, $3);} 148 | Expression EXPOP_SHIFT_LEFT Expression { $$ = DtDoOperator ($1, EXPOP_SHIFT_LEFT, $3);} 149 | Expression EXPOP_GREATER Expression { $$ = DtDoOperator ($1, EXPOP_GREATER, $3);} 150 | Expression EXPOP_LESS Expression { $$ = DtDoOperator ($1, EXPOP_LESS, $3);} 151 | Expression EXPOP_GREATER_EQUAL Expression { $$ = DtDoOperator ($1, EXPOP_GREATER_EQUAL, $3);} 152 | Expression EXPOP_LESS_EQUAL Expression { $$ = DtDoOperator ($1, EXPOP_LESS_EQUAL, $3);} 153 | Expression EXPOP_EQUAL Expression { $$ = DtDoOperator ($1, EXPOP_EQUAL, $3);} 154 | Expression EXPOP_NOT_EQUAL Expression { $$ = DtDoOperator ($1, EXPOP_NOT_EQUAL, $3);} 155 | Expression EXPOP_AND Expression { $$ = DtDoOperator ($1, EXPOP_AND, $3);} 156 | Expression EXPOP_XOR Expression { $$ = DtDoOperator ($1, EXPOP_XOR, $3);} 157 | Expression EXPOP_OR Expression { $$ = DtDoOperator ($1, EXPOP_OR, $3);} 158 | Expression EXPOP_LOGICAL_AND Expression { $$ = DtDoOperator ($1, EXPOP_LOGICAL_AND, $3);} 159 | Expression EXPOP_LOGICAL_OR Expression { $$ = DtDoOperator ($1, EXPOP_LOGICAL_OR, $3);} 160 161 /* Parentheses: '(' Expression ')' */ 162 163 | EXPOP_PAREN_OPEN Expression 164 EXPOP_PAREN_CLOSE { $$ = $2;} 165 166 /* Label references (prefixed with $) */ 167 168 | EXPOP_LABEL { $$ = DtResolveLabel (DtParsertext);} 169 170 /* Default base for a non-prefixed integer is 16 */ 171 172 | EXPOP_NUMBER { AcpiUtStrtoul64 (DtParsertext, (ACPI_STRTOUL_BASE16 | ACPI_STRTOUL_64BIT), &$$);} 173 174 /* Standard hex number (0x1234) */ 175 176 | EXPOP_HEX_NUMBER { AcpiUtStrtoul64 (DtParsertext, (ACPI_STRTOUL_BASE16 | ACPI_STRTOUL_64BIT), &$$);} 177 178 /* TBD: Decimal number with prefix (0d1234) - Not supported by strtoul64 at this time */ 179 180 | EXPOP_DECIMAL_NUMBER { AcpiUtStrtoul64 (DtParsertext, ACPI_STRTOUL_64BIT, &$$);} 181 ; 182 %% 183 184 /*! [End] no source code translation !*/ 185 186 /* 187 * Local support functions, including parser entry point 188 */ 189 #define PR_FIRST_PARSE_OPCODE EXPOP_EOF 190 #define PR_YYTNAME_START 3 191 192 193 /****************************************************************************** 194 * 195 * FUNCTION: DtParsererror 196 * 197 * PARAMETERS: Message - Parser-generated error message 198 * 199 * RETURN: None 200 * 201 * DESCRIPTION: Handler for parser errors 202 * 203 *****************************************************************************/ 204 205 void 206 DtParsererror ( 207 char const *Message) 208 { 209 DtError (ASL_ERROR, ASL_MSG_SYNTAX, 210 Gbl_CurrentField, (char *) Message); 211 } 212 213 214 /****************************************************************************** 215 * 216 * FUNCTION: DtGetOpName 217 * 218 * PARAMETERS: ParseOpcode - Parser token (EXPOP_*) 219 * 220 * RETURN: Pointer to the opcode name 221 * 222 * DESCRIPTION: Get the ascii name of the parse opcode for debug output 223 * 224 *****************************************************************************/ 225 226 char * 227 DtGetOpName ( 228 UINT32 ParseOpcode) 229 { 230 #ifdef ASL_YYTNAME_START 231 /* 232 * First entries (PR_YYTNAME_START) in yytname are special reserved names. 233 * Ignore first 6 characters of name (EXPOP_) 234 */ 235 return ((char *) yytname 236 [(ParseOpcode - PR_FIRST_PARSE_OPCODE) + PR_YYTNAME_START] + 6); 237 #else 238 return ("[Unknown parser generator]"); 239 #endif 240 } 241 242 243 /****************************************************************************** 244 * 245 * FUNCTION: DtEvaluateExpression 246 * 247 * PARAMETERS: ExprString - Expression to be evaluated. Must be 248 * terminated by either a newline or a NUL 249 * string terminator 250 * 251 * RETURN: 64-bit value for the expression 252 * 253 * DESCRIPTION: Main entry point for the DT expression parser 254 * 255 *****************************************************************************/ 256 257 UINT64 258 DtEvaluateExpression ( 259 char *ExprString) 260 { 261 262 DbgPrint (ASL_DEBUG_OUTPUT, 263 "**** Input expression: %s (Base 16)\n", ExprString); 264 265 /* Point lexer to the input string */ 266 267 if (DtInitLexer (ExprString)) 268 { 269 DtError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, 270 Gbl_CurrentField, "Could not initialize lexer"); 271 return (0); 272 } 273 274 /* Parse/Evaluate the input string (value returned in DtParserResult) */ 275 276 DtParserparse (); 277 DtTerminateLexer (); 278 279 DbgPrint (ASL_DEBUG_OUTPUT, 280 "**** Parser returned value: %u (%8.8X%8.8X)\n", 281 (UINT32) DtParserResult, ACPI_FORMAT_UINT64 (DtParserResult)); 282 283 return (DtParserResult); 284 } 285